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8ba0a58f8d
If user or management application wants to create a guest,
it may be useful to know the cost of internode latencies
before the guest resources are pinned. For example:
<capabilities>
<host>
...
<topology>
<cells num='2'>
<cell id='0'>
<memory unit='KiB'>4004132</memory>
<distances>
<sibling id='0' value='10'/>
<sibling id='1' value='20'/>
</distances>
<cpus num='2'>
<cpu id='0' socket_id='0' core_id='0' siblings='0'/>
<cpu id='2' socket_id='0' core_id='2' siblings='2'/>
</cpus>
</cell>
<cell id='1'>
<memory unit='KiB'>4030064</memory>
<distances>
<sibling id='0' value='20'/>
<sibling id='1' value='10'/>
</distances>
<cpus num='2'>
<cpu id='1' socket_id='0' core_id='0' siblings='1'/>
<cpu id='3' socket_id='0' core_id='2' siblings='3'/>
</cpus>
</cell>
</cells>
</topology>
...
</host>
...
</capabilities>
We can see the distance from node1 to node0 is 20 and within nodes 10.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
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* Copyright (C) IBM Corp 2014
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#include <config.h>
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#include <stdlib.h>
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#include "testutils.h"
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#include "capabilities.h"
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#include "virbitmap.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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#define MAX_CELLS 4
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#define MAX_CPUS_IN_CELL 2
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#define MAX_MEM_IN_CELL 2097152
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/*
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* Build NUMA Toplogy with cell id starting from (0 + seq)
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* for testing
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*/
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static virCapsPtr
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buildNUMATopology(int seq)
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{
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virCapsPtr caps;
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virCapsHostNUMACellCPUPtr cell_cpus = NULL;
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int core_id, cell_id;
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int id;
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if ((caps = virCapabilitiesNew(VIR_ARCH_X86_64, 0, 0)) == NULL)
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goto error;
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id = 0;
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for (cell_id = 0; cell_id < MAX_CELLS; cell_id++) {
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if (VIR_ALLOC_N(cell_cpus, MAX_CPUS_IN_CELL) < 0)
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goto error;
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for (core_id = 0; core_id < MAX_CPUS_IN_CELL; core_id++) {
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cell_cpus[core_id].id = id + core_id;
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cell_cpus[core_id].socket_id = cell_id + seq;
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cell_cpus[core_id].core_id = id + core_id;
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if (!(cell_cpus[core_id].siblings =
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virBitmapNew(MAX_CPUS_IN_CELL)))
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goto error;
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ignore_value(virBitmapSetBit(cell_cpus[core_id].siblings, id));
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}
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id++;
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if (virCapabilitiesAddHostNUMACell(caps, cell_id + seq,
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MAX_MEM_IN_CELL,
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MAX_CPUS_IN_CELL, cell_cpus,
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0, NULL) < 0)
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goto error;
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cell_cpus = NULL;
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}
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return caps;
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error:
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virCapabilitiesClearHostNUMACellCPUTopology(cell_cpus, MAX_CPUS_IN_CELL);
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VIR_FREE(cell_cpus);
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virObjectUnref(caps);
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return NULL;
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}
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static int
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test_virCapabilitiesGetCpusForNodemask(const void *data ATTRIBUTE_UNUSED)
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{
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const char *nodestr = "3,4,5,6";
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virBitmapPtr nodemask = NULL;
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virBitmapPtr cpumap = NULL;
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virCapsPtr caps = NULL;
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int mask_size = 8;
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int ret = -1;
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/*
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* Build a NUMA topology with cell_id (NUMA node id
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* being 3(0 + 3),4(1 + 3), 5 and 6
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*/
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if (!(caps = buildNUMATopology(3)))
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goto error;
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if (virBitmapParse(nodestr, 0, &nodemask, mask_size) < 0)
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goto error;
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if (!(cpumap = virCapabilitiesGetCpusForNodemask(caps, nodemask)))
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goto error;
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ret = 0;
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error:
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virObjectUnref(caps);
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virBitmapFree(nodemask);
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virBitmapFree(cpumap);
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return ret;
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}
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static int
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mymain(void)
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{
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int ret = 0;
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if (virtTestRun("virCapabilitiesGetCpusForNodemask",
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test_virCapabilitiesGetCpusForNodemask, NULL) < 0)
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ret = -1;
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return ret;
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}
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VIRT_TEST_MAIN(mymain)
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